Harmonica Therapy
The harmonica is a good respiratory therapy tool. If you play harp you might try holding a blues harmonica class at the local nursing home or senior center. You won't make any money, but it may help someone live a longer happier life. Teaching harp is easy and fun and all you need is a few cheap harps and just a little more expertise than the people you are teaching.
Something to think about doing in the new year.
Read this article: Musical medicine Lung patients get a lift from the humble harmonica